My experience with Sprint is great, but I don't hold my breath about how far they will go to keep me... They only care about new customers from what I have seen, once you are one, you don't get the killer deals the new customers do. If you complain too much, they can and may drop you.
The few people here who have gotten great deals and free this and that are a very small percentage of Sprint users, so it is my opinion that they are not the Majority. I have been with Sprint since 1998, and have no intention of jumping ship, and have had no problems, very happy, but I don't expect them to do a dance to keep me either...
P.S. Msydnor, any chance you can share you sucess story with us? That all sounds great, did you do it over the phone or online? Thanks!